Oximinophosphonodithioates

ABSTRACT

Compounds having the formula   IN WHICH R is (1) alkyl or (2) lower alkylthiomethyl; R1 is alkyl; R2 is alkyl; and R3 is (1) hydrogen, (2) lower alkylthio, (3) cyano, (4) phenylthio, (5) substituted phenylthio wherein the substituent is halogen, WHEREIN R4 is hydrogen or alkyl, (7) halophenyl, (8) phthalimido, (9) vinyl, (10) carboalkoxy, (11) alkyl, (12) ethynyl, (13) CCl2=CR5-wherein R5 is hydrogen or chlorine, (14) CH2OC(O)NH(lower alkyl) or (15) benzylthio, their use as insecticides and acaricides, process for preparing the compounds, intermediates and a process for preparing intermediates.

United States Patent Gutman [54] OXIMINOPHOSPHONODITHIOATES [72] Inventor: Arnold D. Gutman, Berkeley, Calif.

[73] Assignee: Stauffer Chemical Company, New York,

[22] Filed: Apr.6,1970

[21] Appl.No.: 26,148

[52] U.S. Cl. ..260/940, 260/326 S, 260/502.5, 260/938, 260/943, 260/944, 260/968, 260/971,

[51] Int. Cl ..C07f 9/06, AOln 9/36 [58] Field of Search ..260/940, 944, 938, 943

[56] References Cited UNITED STATES PATENTS 2,816,128 12/1957 Allen ..260/944X 2,957,016 10/1960 Diamond ..260/944X Primary Examiner-Joseph Rebold Assistant Examiner-Anton H. Sutto Attorney-Daniel C. Block, Edwin H. Baker and Albert J. Adamcik [4 1 May 30, 1972 ABSTRACT Compounds having the formula R S SCH R ll C=NO P R R2 in which R is (1) alkyl or (2) lower alkylthiomethyl: R is alkyl; R is alkyl; and R is (1) hydrogen, (2) lower alkylthio, (3) cyano, (4) phenylthio, (S) substituted phenylthio wherein the substituent is halogen,

(6) C Nhr' mediates.

10 Claims, N0 Drawings iii OXIlVIINOPl-IOSPHONODITHIOA'IES This invention relates to certain novel chemical compounds, their use as insecticides and acaricides, a process for preparing the compounds, intermediates useful in preparing the compounds and process for preparing the intermediates. More particularly, the chemical compounds are certain oximinophosphonodithioates.

The compounds of this invention are those having the formula s SOIL-R3 wherein R is hydrogen or alkyl having one to four carbon atoms, preferably methyl; (7) halophenyl, preferably dichlorophenyl; (8) phthalimido; (9) vinyl; (l) carboalkoxy having one to five carbon atoms; l2) ethynyl; (l3) CCl CR wherein R is hydrogen or chlorine; (l4) CH OC(O)Nl-l(lower alkyl) or l5) benzylthio.

The compounds of the present invention can be prepared according to the following reactions:

in which R, R, R and R are as defined.

In the event that the desired compound cannot be prepared because of difficulty of preparing or obtaining the compound HSCH R of reaction 1(b), then the following reaction can be utilized to obtain the compounds of this invention.

in which R, R, R and R- are as defined and X is chlorine, bromine, or iodine. The compound recited in reaction la, and lb when R is lower alkylthiomethyl having one to four carbon atoms and R is alkyl having one to four carbon atoms, if not obtainable can be prepared according to the following reaction:

RSH ClCHzCR & RSCHgCR III(b) 0 ll NaHCO: RSCH2CR H2NOH-HC1 RS CH2 C=NOH Preferably, reaction la is carried out by reacting preferably equal mole amounts of the two reactants. If an excess of either reactant is used, the reaction still proceeds but yields are reduced. The reactants can be combined in any desired manner but preferably, the reaction is run in a solvent such as THF by first preparing the salt of the oxime reactant with an acid acceptor such as potassium t-butoxide at room temperature and then preferably, slowly adding the dichloride reactant thereto, preferably in solution with a solvent, for example, THF, at a temperature below about 15 C. for control. However, the oxime reactant can be used in place of the salt, preferably in the presence of the acid acceptor. The resulting produce is recovered and purified by standard procedure. For example, the resulting product can be recovered from the reaction mixture and purified from the reaction mixture by adding the mixture to a nonpolar solvent such as benzene. The benzene mixture is then washed with water, dilute NaOl-l solution and then again by water. The benzene is evaporated after the water has been removed, for example, by treatment with anhydrous MgSO to yield the purified product.

Reaction lb is carried out by reacting preferably equal mole amounts of the two reactants. If an excess of either reactant is used, the reaction still proceeds but yields are reduced. The reactants can be combined in any manner but preferably the phosphorus-containing reactant is slowly added to the reactant containing the SH group in a solvent such as THF, preferably with stirring. More preferably, an alkali metal salt of this reactant is used to reduce the chance of a violent reaction. The temperature of the reaction is not critical, however, better yields are obtained by heating the reactants at reflux for a time sufficient to allow completion of the reaction. The resulting product can be recovered from the reaction mixture and purified by standard procedures. For example, the desired reaction product can be recovered from the reaction mixture by adding the mixture to a non-polar solvent such as benzene. The benzene mixture is then washed with water, dilute NaOH solution and then again by water. The benzene is evaporated after the water has been removed, for example, by treatment with anhydrous MgSO. to yield the purified product.

The process of this invention is represented by reaction lla and gives intermediate compounds useful to prepare the compounds of this invention. In other words, the process of this invention is a process for preparing a compound having the formula in which R, R, and R are as defined comprising reacting a com-pound of the formula in which R and R are as defined with a compound of the formula in which R is as defined.

The process of this invention is carried out by merely reacting preferably, about 2 moles of the oxime reactant with preferably about one mole of the thionophosphine sulfide reactant. If different proportions of either reactant are used, the reaction still proceeds but yields are lowered. The reactants can be combined in any desired manner. The reaction readily proceeds at room temperature and preferably is run under anhydrous conditions in a common solvent for the reactants such as benzene. The dithiophosphonic acid product can be recovered from its solvents in pure form, but it is preferred not to do so. If prolonged storage of the compound is desired, it is preferable to prepare either the alkali, alkaline or heavy metal salt of the acid.

Another process of this invention is represented by reaction Ilb which utilizes as a reactant the product of reaction Ila preferably as a solution in the solvent utilized for reaction Ila.

In this process, the reaction is carried out by reacting preferably about equal mole amounts of the reactants. If an excess of either reactant is used, the reaction still proceeds but again yields are lowered. Although the reactants can be combined in any desired manner, it is preferred to add the halide reactant to a solution of the dithiophosphonic acid reactant, preferably the acid is not recovered from the solvent in which it is prepared. Preferably, the reaction is carried out at below room temperature about l20 C. for control and in the presence of a base, such as triethyl amine, to take up the liberated acid reaction product. The reaction product is recovered by conventional means such as described for reaction Ib.

Preferably, reaction Illa is carried out by preparing and adding chloro2-propanone to a solution of an excess of the mercaptan reactant in the presence of an HCI acceptor at such a rate that the temperature does not exceed about 30 C. Thereafter, the mixture is heated to about 45 C. with stirring until the reaction is complete. The product is recovered by conventional techniques.

Preferably, reaction lllb is carried out by merely stirring at near room temperature for about 1 hour a mixture of about equal amounts of the two reactants dissolved in percent ethanol solution after an aqueous solution of a base, such as sodium carbonate in water which had been slowly added over a period of about minutes. The product is again recovered by conventional techniques.

The novel intermediate compounds of this invention which are (l) useful in preparing the compounds of this invention, for example, by reaction Ilb, heretofore described or (2) as insecticides or acaricides, are those having the formula SSH in which R is (1) alkyl having one to eight carbon atoms, preferably branched chained, more preferably methyl and tbutyl or (2) lower alkylthiomethyl having one to four carbon atoms, preferably one to two carbon atoms; 1-1 is alkyl having one to four carbon atoms, preferably methyl and R is alkyl having one to four carbon atoms, preferably one to two carbon atoms.

These intermediate compounds are preparable according to reaction Ila and the subsequent discussion thereof.

If desired, the alkali, alkaline earth or heavy metal salts of the intermediate acid compounds can be prepared by conventional techniques such as by reacting the acid with a base. The salts will either be mono, di or tri basic depending upon the valency of the metal atom used to form the salt.

Preparation of the compounds of this invention, the process for preparing intermediates and the intermediates are illustrated in the following examples.

EXAMPLE I CH3 S EH O-( Acetoneoximino), ethyl-dithiophosphonic acid This example teaches the synthesis of the oximino, ethyl phosphonic acid useful in the preparation of the compounds of this invention.

24.8 grams (0.1 mole) of ethylthionophosphine sulfide is combined with 200 ml. of anhydrous benzene in a 1,000 ml. beaker. The mixture is magnetically stirred at room temperature, and 22.0 grams (0.3 mole) of acetoneoxime is added and the resulting mixture is stirred for 30 minutes until a clear solution is obtained. The benzene is evaporated to yield the desired product. N l .5507

EXAMPLE II O-( Acetoneoximino ethyl-S-methylphosphonothioate 24.8 grams (0.] mole) of ethylthionophosphine sulfide is combined with 200 ml. of anhydrous dioxane in a 600 ml. beaker. The mixture is magnetically stirred at room tempera ture and 22.0 grams (0.3 mole) of acetoneoxime is added and the resulting mixture is stirred for 30 minutes until a clear solution containing the compound of Example I is obtained.

The solution is cooled in an ice bath to 10 C., and 42.5 grams (0.3 mole) of methyliodide is added, followed by the addition of 30.3 grams (0.3 mole) of triethylamine over a period of 10 minutes, so that the temperature of the reaction does not exceed 20 C. The resulting mixture is NMR. at room temperature for 1 hour, then poured into 500 ml. of benzene. The benzene mixture is washed with 200 ml. of H 0, ml. of saturated NaHCO solution followed by two 100 ml. portions of H 0. The benzene phase is dried with anhydrous MgSO, and evaporated under reduced pressure to yield 40.8 grams (99 percent of theory) of the desired compound. N 1.5500. The structure is confirmed by IR and NMR.

EXAMPLE III Methyl mercapto-2-propanoneoximine This example teaches the synthesis of the alkylthioketoxime useful in the preparation of the compounds of this invention.

into the stirring solution at room temperature. To the resulting 5 mixture is added 185 grams (2.0 moles) of chloro-2- propanone at such a rate that the temperature does not exceed 30 C. After the addition is completed, the mixture is stirred and heated to 45 C. for minutes. The mixture is cooled,

EXAMPLE 1V omsom s somsml,

C=NOI CH3 clm O-(methylthioacetoneoximino)ethyl-2- (methylthiomethyl)phosphone-dithioate.

12.4 grams (0.05 moles) of ethylthiophosphine sulfide, l 1.9

poured into 500 ml of benzene and washed with two 300 ml 10 grams (0.1 moles) of methylmercapto-2-propanoneoxime of portions of water. The benzene phase is dried with anhydrous MgSO and evaporated to yield 165.5 grams (81 percent of theory) of methylmercapto-2-propanone. N 1.4780.

One hundred and four grams 1.0 moles) of the methylmercapto-Z-propanone, 83.5 grams 1.2 moles) of hydroxylamine hydrochloride, 400 ml. of water and 40 ml. of ethanol are combined in a l-liter three-neck flask equipped with a stirrer, thermometer and dropping funnel. The mixture is stirred at room temperature, and a solution of 62 grams (0.5 moles) of sodium carbonate monohydrate in 150 ml. of H 0 is added over a period of minutes. The resulting mixture is stirred at room temperature for one hour and then poured into 1 liter of benzene. The benzene phase is separated, dried with anhydrous MgSO and evaporated to yield 98 grams (82.3 percent of theory) of methylmercapto-2-propanoneoxime. N 1.5190.

Example 1 and 200 ml. of dioxane are combined in a l-liter beaker and stirred magnetically at room temperature until a solution is obtained. The solution is stirred and cooled to 10" C. in an ice bath. 9.7 grams (0.1 moles) of chloromethyl- 15 methylsulfide is added. Next, 15.1 grams (0.15 moles) of triethylamine is added over a period of 10 minutes. The resulting mixture is stirred at room temperature for 1 hour, then poured into 500 ml. of benzene and consecutively is washed with 200 ml. of water, ml. of saturated sodium bicar bonate solution and two 100 ml. portions of water. The benzene phase is dried with anhydrous MgSQ, and evaporated to yield 27 grams (89 percent of theory) of the desired compound. N 1.5937.

The following is a table of certain selected compounds that 25 are preparable according to the procedure described hereto.

Compound numbers are assigned to each compound and are used throughout the remainder of the application.

TABLEI R\ fi/SC ZR C=NOP M.P., Compound C. or number ND30 R R R R 1 (C 3)2C C 2 C 3 C2 5 H CNHCH3 2 1.5840 CH3 CH3 C2115 -SCH3 3 62-66 CH3 CH3 C (a -CNH2 4 1.5923 CH3 CH3 C2 5 y 5 1.5978 CH3 CH3 02 CH CH Cal-I5 -CH=CC]2 C 3 CH3 CzHs CEN CH CH3 C 115 SQ 9 1.5536 CH3 CH; CgHs CECH 10 1.5845 CH3 CH3 C1115 SCH 11 1.5872 CH CH C 115 Cl 12 1.5652 CH3 C11 C 11 -C=CC12 CH CH C 115 CI1OC(Q)NIICII CIHSCII; C11 C 11 -II CJIJSCII! C11 C 115 SCH3 CTR- CH2 CH C 115 SOH3 I, CHaSCiIg CH C 11 CH=CC1:

18 1.5038 CH3 CH CzHs 0 1 Compound No. 2 prepared in Example II. b Compound N0. prepared in Ex mple IV. Semi-solid. V 7 7 The following test illustrate utility of the compounds as insecticides and acaricides.

INSECTlClDAL EVALUATlON TESTS The following insect species were used in evaluation tests for insecticidal activity:

1. Housefly (HF) Musca domestica (Linn.)

2. German Roach (GR) Blatella germanica (Linn) 3. Salt-March Caterpillar (SMC) Estigmene acrea (Drury) 4. Lygus Bug (LB) Lygus hesperus (Knight) 5. Bean Aphid (BA) Aphisfabae (Scop.)

The housefly (HF) was used in evaluation tests of selected compounds as insecticides by the following procedure. A stock solution containing 100 pg/ml. of the toxicant in an appropriate solvent was prepared. Aliquots of this solution were combined with l milliliter of an acetone-peanut oil solution in an aluminum dish and allowed to dry. The aliquots were there to achieve desired toxicant concentration ranging from 100 pg per dish to that at which percent mortality was attained. The dishes were placed in a circular cardboard cage, closed on the bottom with cellophane and covered on top with cloth netting. Twenty-five female houseflies, 3 to 5 days old, were introduced into the cage and the percent mortality was recorded after 48 hours. The LD-SO values are expressed in terms of pg per 25 female flies. The results of these insecticidal evaluation tests are given in Table ll under HF.

In the German Cockroach (GR) tests, 10 one-month old nymphs were placed in separate circular cardboard cages sealed on one end with cellophane and covered by a cloth netting on the other. Aliquots of the toxicants, dissolved in an appropriate solvent, were diluted in water containing 0.002 percent of a wetting agent, Sponto 221, (a polyoxyether of alkylated phenols blended with organic sulfonates). Test concentrations ranged from 0.1 percent downward to that at which 50 percent mortality was obtained. Each of the aqueous suspensions of the candidate compounds was sprayed onto the insects through the cloth netting by means of a hand-spray gun. Percent mortality in each case was recorded after 72 hours, and the LD-SO values, expressed as percent of toxicant in the aqueous spray, were recorded. These values are reported under the column GR in Table II.

For testing the Salt Marsh Caterpillar, test solutions were prepared in an identical manner and at concentrations the same as for the German Cockroach above. Sections of bitter dock (Rumex obtusifolus) leaves, l1.5 inches in length were immersed in the test solutions for 10 to 15 seconds and placed on a wire screen to dry. The dried leaf was placed on a moistened piece of filter paper in a Petri dish and infested with -3rd Instar larvae. Mortality of the larvae was recorded after 72 hours and the LD-50 values are expressed as percent active ingredient in the aqueous suspension.

The Lygus Bug (LB) Lygus hesperur was tested similarly as the German Cockroach. The caged insects were sprayed with the candidate compounds at concentrations ranging from 0.05 percent downward to that at which 50 percent mortality was obtained. After 24 and 72 hours, counts were made to determine living and dead insects. The LD-SO (percent) values were calculated. These values are reported under the column LB" in Table II.

The insect species black bean aphid (BA) Aphis fabae (Scop.) was also employed in the test for insecticidal activity. Young nasturtium (Tropaeolum sp.) plants, approximately 2 to 3 inches tall, were used as the host plants for the beam aphid. The host plant was infested with approximately 50-75 of the aphids. The test chemical was dissolved in acetone, added to water which contained a small amount of Sponto 221, an emulsifying agent. The solution was applied as a spray to the infested plants. Concentrations ranged from 0.05 percent downward until an LD value was achieved. These results are given in Table I] under the column BA.

ACARICIDAL EVALUATION TEST The two-spotted mite (28M), Tetranychus urticae (Koch), was employed in tests for miticides. Young pinto bean plants or lima bean plants (Phaseolus sp.) in the primary leaf stage were used as the host plants. The young pinto bean plants were infested with about 100 mites of various ages. Dispersions of candidate materials were prepared by dissolving 0.1 gram in ml. of a suitable solvent, usually acetone. Aliquots of the toxicant solutions were suspended in water containing 0.002 percent v/v Sponto 221, polyoxyethylene ether sorbitan monolaurate, an emulsifying agent, the amount of water being sufficient to give concentrations of active ingredient ranging from 0.05 percent to that at which 50 percent mortality was obtained. The test suspensions were then sprayed on the infested plants to the point of run off. After 7 days, mortalities of post-embryonic and ovicidal forms were determined. The percentage of kill was determined by comparison with control plants which had not been sprayed with the dancidate compounds. The LD-5O values was calculated using well-known procedures. These values are reported under the columns 2SM-APE" and ZSM-Eggs in Table II.

SYSTEMIC EVALUATION TEST This test evaluates the root absorption and upward translocation of the candidate systemic compound. The two-spotted mite (2SM), Tetranychus urticae (Koch) and the Bean Aphid (BA), Aphis fabae (Scop.) were employed in the test for systemic activity.

Young pinto bean plants in the primary leaf stage were used as host plants for the two-spotted mite. The pinto bean plants were placed in bottles containing 200 ml. of the test solution and held in place with cotton plugs. Only the roots were immersed. The test solutions were prepared by dissolving the compounds to be tested in a suitable solvent, usually acetone, and then diluting with distilled water. The final acetone concentration never exceeded about 1 percent. The toxicants were initially tested at a concentration of 10 parts per million (p.p.m.). Immediately after the host plant was placed in the test solution it was infested with the test species. Mortalities were determined after 7 days.

Young nasturtium plants were used as the host plants for the bean aphid. The host plants were transplanted into one pound of soil that had been treated with the candidate compound. Immediately after planting in the treated soil the plants were infested with the aphids. Concentrations of toxicant in the soil ranged from 10 p.p.m. per pound of soil downward until an LD-SO value was obtained. Mortality was recorded after 72 hours.

The percentage of kill of each test species was determined by comparison with control plants placed in distilled water or untreated soil. The LD-SO values were calculated. These systemic test results are reported in Table [I under the columns BA-sys" and ZSM-sys.

TABLE II. Ll)5o VALUES Two-spotted mites Compound HF, GR, LB, SMC, BA, BA-SYS, PE, EGGS, SYS, number g. percent percent percent percent p.p.m. percent percent p.p.m.

.1 .008 .05 05 .1 .003 3.0 .01 .01 10 .1 .008 3.0 .05 .05 .1 .03 10.0 .01 .03 10 05 003 10. 0 .005 .003 10 .05 .003 100 .03 .03 10 .03 .003 8.0 .005 .01 10 .l .0008 l0.0 .008 .008 10 .03 .0008 3. 0 .008 .01 8 .1 .001 100 .001 .003 10 .l .003 100 .01 .03 10 .1 .03 100 .01 .03 10 .1 .03 10.0 .03 .03 8 .1 .003 3.0 .03 .03 10 .1 .008 10. 0 .008 .03 10 .03 0008 3.0 .008 .03 10 .1 .003 l0.0 .01 ,03 10 .1 .003 .05 .05 10 .l .001 l0.0 .008 .03 10 .1 .01 l0.0 .05 .05 10 .l .0005 R. 0 .003 003 10 1 .0008 3. 0 .003 .003 10 .1 .003 3.0 .03 05 10 .l 0008 5.0 03 05 10 03 003 10. 0 .005 05 10 .1 .008 100 .05 .05 .03 .003 10.0 .005 .05 10 .1 .0008 .1 .003 100 .03 .03 10 .1 .005 .1 .008 100 .01 .03 10 .08 .003 .1 .003 100 .03 .03 10 .1 .003 .1 .003 100 .005 .03 10 .05 .005 .1 .003 1.0 .05 .05 .1 0005 1 003 10. 0 005 05 10 .1 .008 .1 .05 100 .05 .05 .1 .005 .l .03 l0.0 .03 .05 10 .1 .01 .1 .003 100 .05 .05 .1 .003 .1 .003 100 .01 .05 10 .l .03 .l .05 .05 .05 .1 .003 .l .003 8.0 .03 .05 10 .l .008 .l .003 10. 0 .03 .ll5 10 .l .0] .l .003 100 .O5 .05

Two-spoiled miles Compound HF, GR, LB, SMC, BA, IRA-8Y8, PE, EGGS, SYS.

number g percent percent percent percent ppm. pviwut -mn-vnt. p.p.m.

40 .1 .01 1 .008 100 05 115 50 1 .003 .1 .003 10. .005 30- .1 .03 1 .003 5.0 .05 .05 3O .05 .03 .1 0008 5.0 .05 05. 30 .08 .008 .1 .003 100 .05 05 10 .08 .01 .03 0008 100 .05 .05 3O .05 .01 .1 .008 100 .001 05 10 30 08 003 .03 0008 10, 0 .001 115 10 30 .08 .003 .03 0003 10. 0 .005 05 10 30 .1 .03 .1 .003 100 .005 .03 10 30 .1 .03 .1 .008 100 05 05 30 .l .03 .1 .008 10.0 .06 .0fi 50 .08 .005 .i .003 10. 0 .01 06 11) 30 .US .03 .08. .003 10 0 005 115 10 30 l .03 in] .01 10 0 .005 05 10 in I 03 1 10-. In 1 11 -10 in 1 our. l H01! 10 1 mm m 10 no 1 In: 1 '11. a 0!. HI, 5 I M. us (15 .1105 03 10 5 03 l .003 10. 0 05 115 55 1 .03 1 .003 10. 0 ,005 05 10 30 .1 .03 .05 .008 100 .05 05 10 40 1 .03 1 .005 10.0 .05 .U5 U 35 1 .05 .1 .008 100 .05 .0fi 70 .l .05 .1 .008 100 05 .05 10 8 1 .0001 .1 .003 3.0 .005 .03 3 30 .08 .005 .1 .003 0.3 .01 03 10 Compound prepared in Etample I,

As those in the art are well aware, various techniques are available for incorporating the active component or toxicant in suitable pesticidal compositions. Thus, the pesticidal compositions can be conveniently prepared in the form of liquids or solids, the latter preferably as homogeneous free-flowing dusts commonly formulated by admixing the active component with finely divided solids or carriers as exemplified by talc, natural clays, diatomaceous earth, various flours such as walnut shell, wheat, soya bean, cottonseed, and so forth.

Liquid compositions are also useful and normally comprise a dispersion of the toxicant in a liquid media, although it may be convenient to dissolve the toxicant directly in a solvent such as kerosene, fuel oil, xylene, alkylated naphthalenes or the like and use such organic solutions directly. However, the more common procedure is to employ dispersions of the toxicant in an aqueous media and such compositions may be produced by forming a concentrated solution of the toxicant in a suitable organic solvent followed by dispersion in water, usually with the aid of surfact active agents. The latter, which may be the anionic, cationic, or monionic types, are exemplified by sodium stearate, potassium oleate and other alkaline metal soaps and detergents such as sodium lauryl sulfate, sodiurn naphthalene sulfonate, sodium alkyl naphthalane, sulfonate, methyl cellulose, fatty alcohol ethers, polyglycol fatty acid esters and other polyoxyethylene surface active agents. The proportion of these agents commonly comprises l-15 percent by weight of the pesticidal compositions although the proportion is not critical and may be varied to suit any particular situation.

1 claim: 1. The compound having the formula R S SCHg-R C=N O--P 1 Rz in which R is 1 alkyl having one to eight carbon atoms, or (2) lower alkylthiomethyl having one to four carbon atoms;

R is alkyl having one to four carbon atoms;

R is alkyl having one to four carbon atoms;

R is l hydrogen; (2) loweralkylthio having one to four carbon atoms; (3) cyano; (4) phenylthio; (5) substituted phenylthio wherein the substituent is halo, (6) the radical wherein R is hydrogen or alkyl having one to four carbon atoms, (7) halophenyl; (8) benzylthio; (9) vinyl; (l0) carbalkoxy having one to four carbon atoms; l 1) alkyl having one to five carbon atoms; 12) ethynyl; l3 CC1 =CR -wherein R is hydrogen or chlorine; or 14) CH OC(O)NH(lower alkyl).

2. The compound of claim 1 in which R is alkyl having one to four carbon atoms, R is methyl, R is alkyl having one to two carbon atoms, and R is ethylthio.

3. The compound of claim 1 in which R is alkyl having one to four carbon atoms, R is methyl, R is alkyl having one to two carbon atoms, and R is methylthio.

4. The compound of claim I in which R is alkyl having one to four carbon atoms, R is methyl, R is alkyl having one to two carbon atoms, and R is cyano.

5. The compound of claim 1 in which R is alkyl having one to four carbon atoms, R is methyl, R is alkyl having one to two carbon atoms, and R is ethynyl.

6. The compound of claim 2 in which R is methyl, R is methyl, R is ethyl and R is ethylthio.

7. The compound of claim 4 in which R is ethyl, R is methyl, R is ethyl, and R is cyano.

8. The compound of claim 4 in which R is propyl, R is methyl, R is ethyl, and R is cyano.

9. The compound of claim 5 in which R is methyl, R is methyl, R is ethyl, and R is ethy'nyl.

10. The compound of claim 5 in which R is sec-butyl, R is methyl, R is ethyl and R is ethynyl. 

2. The compound of claim 1 in which R is alkyl having one to four carbon atoms, R1 is methyl, R2 is alkyl having one to two carbon atoms, and R3 is ethylthio.
 3. The compound of claim 1 in which R is alkyl having one to four carbon atoms, R1 is methyl, R2 is alkyl having one to two carbon atoms, and R3 is methylthio.
 4. The compound of claim 1 in which R is alkyl having one to four carbon atoms, R1 is methyl, R2 is alkyl having one to two carbon atoms, and R3 is cyano.
 5. The compound of claim 1 in which R is alkyl having one to four carbon atoms, R1 is methyl, R2 is alkyl having one to two carbon atoms, and R3 is ethynyl.
 6. The compound of claim 2 in which R is methyl, R1 is methyl, R2 is ethyl and R3 is ethylthio.
 7. The compound of claim 4 in which R is ethyl, R1 is methyl, R2 is ethyl, and R3 is cyano.
 8. The compound of claim 4 in which R is propyl, R1 is methyl, R2 is ethyl, and R3 is cyano.
 9. The compound of claim 5 in which R is methyl, R1 is methyl, R2 is ethyl, and R3 is ethynyl.
 10. The compound of claim 5 in which R is sec-butyl, R1 is methyl, R2 is ethyl and R3 is ethynyl. 